Circular plotting protractor patented by E.R. Zenthon in 1960
Circular plotting protractor patented by E.R. Zenthon in 1960, aluminium 2ft inner diameter.
Circular plotting protractor patented by E.R. Zenthon in 1960
- Made:
- 1960-1970
Circular plotting protractor patented by E.R. Zenthon in 1960, aluminium, 2 ft inner diameter, with 8 aluminium scales and perspex centring sheet in fitted wooden box
Details
- Category:
- Mathematics
- Object Number:
- 1988-9
- type:
- drawing instruments and protractor
- credit:
- Gimpel, A.
Parts
Scale Ruler, 1/8 and 1/4 scales
Aluminium scale ruler, scales 1/8 and 1/4, for use with E.R. Zenthon patented protractor.
Scale Ruler, 1/500 feet and 1/2500 feet scales
Aluminium scale ruler, scales 1/500 feet and 1/2500 feet, for use with E.R. Zenthon patented protractor.
Scale Ruler, 20 and 40 scales
Aluminium scale ruler, scales 40 and 20, for use with E.R. Zenthon patented protractor.
Scale Ruler, 10 and 20 scales
Aluminium scale ruler, scales 10 and 20, for use with E.R. Zenthon patented protractor.
Scale Ruler, 1/16 and 1/32 scales
Aluminium scale ruler, scales 1/16 and 1/32, for use with E.R. Zenthon patented protractor.
Scale Ruler, 1/1250 feet and 6 in=1 mile feet scales
Aluminium scale ruler, scales 1/1250 feet and 6 in=1 mile feet, for use with E.R. Zenthon patented protractor.
Scale Ruler, 1/100 metre and 1/250 metre scales
Aluminium scale ruler, scales 1/100 metre and 1/250 metre, for use with E.R. Zenthon patented protractor.
Scale Ruler, 100 and 50 scales
Aluminium scale ruler, scales 100 and 50, for use with E.R. Zenthon patented protractor.
Perspex Sheet for use in Plotting
Perspex sheet, for use with E.R. Zenthon patented protractor.
Box for E.R. Zenthon Protractor and Scales
Fitted wooden box for housing circular plotting protractor patented by E.R. Zenthon, eight aluminium scales, and a perspex sheet.
- Materials:
- wood (unidentified) , metal (unknown) and felt
- Object Number:
- 1988-9/11
- type:
- box - container
